Re: [PATCH 04/14] net: hns: Annotate struct ppe_common_cb with __counted_by

[Gustavo A. R. Silva]

On 9/22/23 11:28, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> As found with Coccinelle[1], add __counted_by for struct ppe_common_cb.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Yisen Zhuang <yisen.zhuang@xxxxxxxxxx>
> Cc: Salil Mehta <salil.mehta@xxxxxxxxxx>
> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
> Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
> Cc: Paolo Abeni <pabeni@xxxxxxxxxx>
> Cc: netdev@xxxxxxxxxxxxxxx
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>

Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>

Thanks
--
Gustavo

> ---
>   drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.h b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.h
> index 0f0e16f9afc0..7e00231c1acf 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.h
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.h
> @@ -92,7 +92,7 @@ struct ppe_common_cb {
>   	u8 comm_index;   /*ppe_common index*/
>   
>   	u32 ppe_num;
> -	struct hns_ppe_cb ppe_cb[];
> +	struct hns_ppe_cb ppe_cb[] __counted_by(ppe_num);
>   
>   };
>